Here's an example of a picture I created from scratch in Inkscape using an image I found in the excellent TV Ark. In fact it's the first thing I ever did in Inkscape, and I didn't really know what I was doing! If you click on the image you'll see it at the size I actually drew it.
Simon Luxton's Westward Television section on TV Ark is a particular favourite of mine and I recommend a visit.
The image is a .png exported from Inkscape. The .svg file that creates this image is 28K, which is not bad going.